Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Accounting Policies [Abstract]
Weighted average shares - basic									137,750,158	145,594,300	148,273,904
Diluted share equivalents									1,632,000	2,047,000	2,181,000
Weighted average shares - diluted									139,381,940	147,641,113	150,455,193
Net earnings for basic and diluted earnings per share computation	$ 56,433	$ 47,776	$ 47,955	$ 55,947	$ 72,956	$ 67,336	$ 58,340	$ 61,592	$ 208,111	$ 260,224	$ 247,377
Net earnings per share - basic	$ 0.41	$ 0.35	$ 0.35	$ 0.40	$ 0.51	$ 0.46	$ 0.40	$ 0.42	$ 1.51	$ 1.79	$ 1.67
Net earnings per share - diluted	$ 0.41	$ .34	$ 0.34	$ 0.40	$ 0.50	$ 0.46	$ 0.39	$ 0.41	$ 1.49	$ 1.76	$ 1.64